Drawing frame with passages for use on spinning machines



J. \(ON TRUMBACH DRAWING FRAME WITH PASSAGES FOR USE ON SPINNING MACHINES Dec. 23, 1930'.

Filed March 2. 1929 Patented 23, 1930 UNITED STATES JOHANNES VQN TR'U'MBACH, OF DUSSELDORF-OBERKASSEL, GERMAN Y DRAWING FRAME WITH PASSAGES Application filed March 2, 1929, Serial N'o.

The invention relates to an improved nipper for use in a drawing apparatus for spinning machines for co-operating with a lower drawing-cylinder arranged between a pair of feed cylinders and a pair of delivery cylinders.

Theobjects of the invention are toprevent the accumulation of fibres and consequent prevention of the complete straightening out and 1 stretching of the fibres which occur when the usual loose light top rollers are used and also to provide for more weight than can be applied with the usual top rollers of small diameter, a heavy weight being desirable particularly with coarse feeds.

It is also the object of the invention to tain the above desirable results with the aid of a nipper of simple construction of few parts not likely to impede the operatives in go their work or to require undue attention.

With the above objects in view the invention consists inthe novel construction, combination and arrangement of 'partshereinafter referred to and defined in the appended claims.

In the accompanying drawings:

Figure 1 is a side view of one form of nipper according to the invention shown a plied to a drawing cylinder, between pairs of feed and delivery cylinders, which are only indicated diagrammatically, other parts of the drawing frame being omitted as well known in the art'and not necessary to make the present description clear.

Figure 2. is a sectional end view of the nipper, the section being taken on 11-11, Figure 3. I

Figure 3 is a plan of the nipper.

Figure 4 is a side view half in section on IV-IV, Figure 3.

In the drawings a, a are the delivery cyllnders and b, b the feed cylinders, c is an under drawing cylinder placed between the pa rs of cylinders a, a and b, b and d 1s the mpper in osi-tion over the drawing cylinder 0.

he pressure surface of the nipper 11 consists of a plurality-for example, two, small rollers g, provided with frlctlonal peripheries, or example, as indicated by the plain roller g in Figures .3 and 4, they may grooves FOR USE ON SPINNING MACHINES 344,086, and in Germany August 23, 1928.

be smooth, covered with leather or other frictional material as known in the art, or as indicated by theroller gin Figures 3 and 4, they may be provided with grooves of any conventional type, or any equivalent grooving capable of providing the necessary frictional surface. The rollers g, g have their end journals 1):, m mounted so as to havea certain amount of play in slots h, h in end pieces 11., n of the body 0 of the nipper d, 80

the end pieces a, n being conveniently secured to the body 0 by screws 1, the heads of which form journals for thenipper.

Interdriving means are provided between the rollers g, g, for example, such rollers 5 have driving bearing surfaces 11 which press against rotating rings orfriction wheels 76 running on ball bearings 19. By this means the rotary movement and peripheral speed of one roller are positively imparted to the other roller. Neither of the two rollers can make a false movement relatively to the other and so lead to the accumulation of the fibres, and render more diflicult or entirely prevent, the complete straightening out andstretching of the fibres. The drawing process will proceed without interruption owing to the positive uniform rotary movements and peripheral speeds of the two rollers g, g, which is of the greatestimportance-in the process 80 of spinning.

If the rollers g, g are provided in a known manner with fine annular or screw-threaded rooves, the combing action of the fine ribs etween the annular or screw-threaded will result in the loosening and separat f the bundle of fibres of the rough yarn, spread over a distance e ual to the distance between the rollers g, g this distance being approximately equal to the average length of the fibres. The fibres of the rough yarn or bundle of fibres, which are previous ly tightly held together, are so effectively loosened and shaken up that the single fibres are enabled and assisted to pass smoothly through the fine annular or screw-threaded, grooves in the rollers g, g and thus a high degree of drawing is obtained. This is a I great advantage of the drawing frame according to the invention.-

The weight of the nipper assists the drawing cylinder to drive the rollers g, g and influences the drawing process of-the rough yarn. The weight may be apportioned as de- 5 sired, without increasing the diameter of the rollers g, 'g' or their distance away from the contactlng parts of the pair of delivery cyliimilers a, a or for enlarging the force drawing e d. I r The nipper can be inserted into and removed from the existing bearings in the same way as the known loose running top rollers. The heads of the screws Z act as journals, so that it is unnecessary to make any mechanical alterations, while it is easily handled.

I claim; i 1.- Foruse in a drawing apparatus' for spinning machines, a nipper movably mounted above a drawing cylinder including a pressure jaw for hearing on the yarn said pressure jaw presenting pressure surfaces, for co-operating with said drawing cylinder, comprising freelyfinounted rollers provided with frictional peripheral surfaces and interdrivingmeans etween said rollers, substantially as and for the purposes'hereinbefore set forth.

2. For use in a drawing apparatus for spinning machines, a nipper adapted to be mounted movably above a drawing cylinder and comprisin a pressure jaw provided with journals and s otted bearings at its ends and rollers freely mounted in said bear'ngs, said rollers constituting pressure surf ces and having frictional peripheries to co-operate with said drawing cylinder substantially as and for the urposes hereinbefore set forth.

' 3. For use 1n a drawing apparatus for spinning machines, a nipper comprisin a body having end journals, and elongated earings, rollers freely mounted in said bearings to serve as pressure surfaces, said rollers having grooved eripheries, wheels freely mounted at the en 5 of said'body and having a frictional driving conneqaion with the said "two, rollers, to thereby provide a driving connection between said rollers.

In testimony whereof I have signed 111 name to this specification.

JOHANNES VON. TRUMBACH; 

